Which is when Gary Cole comes in and tells the father of the bride he couldn't be more wrong, "my friend. Can I call you friend?" Chuck asks Sarah what her father's doing, and she asks him to give him time. Gary Cole goes on that Casey will pull the trigger, and he won't miss. Then he says he has a daughter, too, and based on this situation he thinks the father of the bride probably isn't the best father in the world. "Join the club. I guess the only thing we can hope for is that someday our little girls might be happy despite us. And yours is. She's upstairs right now in her white dress. And here you are, about to take a bullet in the head. So, do one thing for her, friend. Put the gun down." Sarah's clearly touched, but still has her gun drawn. Father of the bride puts the gun down, and Casey starts to handcuff him. Sarah smiles at her dad, who gives her a knowing wink. And cop cars show up, obviously called by someone who saw or heard the commotion. Casey shows them his badge, and says "Colonel John Casey, NSA." Which is when we see that Kath's nearby in a car, watching him reveal himself as a hero. He notices her, too, and looks a little wistful and a little relieved, which is a lot of emotion for Casey to display.
Castle. General Redhead is lecturing Chuck and Sarah again about their unprofessional and unacceptable behavior regarding the wedding planner. They both apologize, and Chuck swears never to fake a flash again. She adds that her superiors are quite impressed, however, that they obtained the Zephyr device (which I guess was on the father of the bride). Though she does wonder how they accomplished that without any CIA resources. They start to explain, but she doesn't want to know. She welcomes them back, and then dismisses them. She shuts down, and they agree that went better than expected.